21321210203310 has 32 divisors (see below), whose sum is σ = 51172099346592. Its totient is φ = 5685523292160.

The previous prime is 21321210203303. The next prime is 21321210203317. The reversal of 21321210203310 is 1330201212312.

It is an interprime number because it is at equal distance from previous prime (21321210203303) and next prime (21321210203317).

It is a super-2 number, since 2×21321210203310² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321210203317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6988051 + ... + 9564270.

It is an arithmetic number, because the mean of its divisors is an integer number (1599128104581).

Almost surely, 2^{21321210203310} is an apocalyptic number.

21321210203310 is an abundant number, since it is smaller than the sum of its proper divisors (29850889143282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21321210203310 is a wasteful number, since it uses less digits than its factorization.

21321210203310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16595268.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21321210203310 its reverse (1330201212312), we get a palindrome (22651411415622).

The spelling of 21321210203310 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred ten million, two hundred three thousand, three hundred ten".